your_project
     |-- your_project/
     |-- myapp/
     |-- templates/
          |-- admin/
              |-- myapp/
                  |-- change_form.html  <- do not misspell this

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')], # <- add this line
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

~/.virtualenvs/edge/lib/python2.7/site-packages/django/contrib/admin/templates/admin

{% extends "admin/change_form.html" %}
{% block field_sets %}
     {# your modification here #}
{% endblock %}

# urls.py
...
from django.contrib import admin

admin.site.index_template = 'admin/my_custom_index.html'
admin.autodiscover()

class Myadmin(admin.ModelAdmin):
    change_form_template = 'change_form.htm'

app_index.html
change_form.html
change_list.html
delete_confirmation.html
object_history.html

your_project
 |-- your_project/
 |-- myapp/
 |-- templates/
      |-- admin/
          |-- login.html  <- do not misspell this

{% extends 'django_admin/change_form.html' %}

Your stuff here

mysite-container/         # project container directory
    manage.py
    mysite/               # project package
        __init__.py
        admin.py
        apps.py
        settings.py
        urls.py
        wsgi.py
    app1/
    app2/
    ...
    static/
    templates/

ln -s /usr/local/lib/python2.7/dist-packages/django/contrib/admin/templates/admin/ templates/django_admin

~/virtualenvs/mydomain/lib/python2.7/site-packages/django/contrib/admin/templates/admin

/templates/
   admin
   admin_src -> [to django source]
   base.html
   index.html
   sitemap.xml
   etc...

{% extends "admin_src/base.html" %}

{% block extrahead %}
<link rel='shortcut icon' href='{{ STATIC_URL }}img/favicon-admin.ico' />
{% endblock %}

admin.site.index_template = 'admin/custom_index.html'

admin.AdminSite.app_index_template = "servers/servers-home.html"

change_list_template = "servers/servers_changelist.html"

change_form_template = "servers/server_changeform.html"